Flat Rolling Analysis Concepts
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Questions and Answers

In flat rolling analysis, what does the coefficient of friction depend on?

  • Rolling speed and work material
  • Lubrication, work material, and working temperature (correct)
  • Final velocity and roll speed
  • Roll radius and lubrication
  • What is the formula to calculate the flow stress (σf) based on true strain (ε) in rolling?

  • σf = kεn
  • σf = nε / (1 + k)
  • σf = kεn / (1 + n) (correct)
  • σf = k / (1 + nε)
  • What is a characteristic condition of hot rolling known as sticking?

  • The final velocity increases significantly
  • The rolls stop moving
  • The hot work surface adheres to the rolls (correct)
  • The deformation decreases
  • Where is the peak pressure typically located in flat rolling along the contact length?

    <p>At the neutral point</p> Signup and view all the answers

    What is the term used to describe the sequence in impression-die forging that causes flash to form in the gap between die plates?

    <p>Compression</p> Signup and view all the answers

    In flashless forging, what occurs just before the initial contact with the workpiece?

    <p>Partial compression</p> Signup and view all the answers

    What is a key requirement for both conventional and precision forgings after the initial forging process?

    <p>Flash trimming</p> Signup and view all the answers

    Which type of forging hammer operates based on gravity for the drop mechanism?

    <p>Gravity drop hammer</p> Signup and view all the answers

    What is the purpose of upsetting in forging?

    <p>To form a head on a bolt or similar hardware item</p> Signup and view all the answers

    What is the main characteristic of swaging in forging?

    <p>Reducing the diameter of solid rod stock</p> Signup and view all the answers

    In radial forging, how do the dies and workpiece move?

    <p>The dies remain fixed while the workpiece rotates</p> Signup and view all the answers

    What is roll forging primarily used for?

    <p>Tapering a tube</p> Signup and view all the answers

    What is the purpose of annealing in the preparation steps for continuous drawing of wire?

    <p>To increase the ductility of the material</p> Signup and view all the answers

    What defect in extruded products is characterized by a centerburst?

    <p>Center cracking</p> Signup and view all the answers

    In wire and bar drawing, what is the purpose of prelubrication after cleaning?

    <p>To prevent damage of the product and die</p> Signup and view all the answers

    What type of extrusion involves a combination of forward and backward motion?

    <p>Impact extrusion</p> Signup and view all the answers

    What is the formula to calculate the rolling force?

    <p>F = 175.7 × 300 × 27.4</p> Signup and view all the answers

    How is the torque required to drive each roll calculated?

    <p>T = 0.5 × 1,444,786 × 27.4</p> Signup and view all the answers

    What is the power, in Watts, required for the rolling process?

    <p>207,201 N.m/s</p> Signup and view all the answers

    How can rolling force and power be reduced in the rolling process?

    <p>Increasing the draft in each pass</p> Signup and view all the answers

    What is the primary purpose of using ring rolling in a manufacturing process?

    <p>To increase wall thickness of a ring</p> Signup and view all the answers

    In open-die forging, what does 'barreling' typically refer to?

    <p>A deformation where the workpiece narrows towards one end</p> Signup and view all the answers

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